BoilerFaultCodesYour boiler is failing to light properly or cannot detect that the flame has started, resulting in no heating or hot water.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Fault/Lockout - Ignition failure or sensing/spark electrode and lead fault.
What causes this fault?
This fault occurs when the boiler tries to ignite but fails to create a stable flame, causing the system to shut down for safety. The most common reasons are a worn-out ignition spark, a blocked gas supply, or an internal sensor failing to detect that the burner has actually lit. In some cases, a fault with the main control board means the boiler isn't sending the correct signal to start the ignition process.
This issue can be more frequent during extreme cold spells if the external gas regulator freezes or if there is a sudden drop in local gas pressure.
DIY fix possible
Check that your gas prepayment meter has creditEnsure other gas appliances in your home are working to confirm gas supplyPress the Reset button or turn the dial to 'OFF/RESET' and back to 'ON'
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Protect yourself from future repair bills
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